The first one is many different tests
the second one is just a CBC (complete blood count)
The first is much more extensive
Yes, that sample would be fine
I don't see any negatives other than possibly some false positive tests
The important factors in the CBC are just white count (infection), blood counts and platelets (blood clotting cells). There is not much more info in there.
just a very basic test.
The other covers MANY parts of your system